From a firms short run production function, the marginal product of labor and the average product of labor may be determined. The average product of labor is:
total output divided by the number of workers employed
the change in total cost attributed to the increased output from employing an additional worker
the change in total revenue attributed to the increased output from employing an additional worker
the change in total output attributed to producing an extra unit of a good
the change in total output attributed to employing an additional worker